Wow. I'm going to have to modify my fairly positive worldview downward a few notches to accomodate the existence of people like that.
Here's my problem after seeing these displays of feebleminded imbecility. Evolution can't exist because these people would have been wiped out long ago, but Intelligent Design can't work because we're created in God's image and then how do you explain these frickin' moronic stumps? Therefore, the only good explanation left is that mankind is a comedic experiment performed by aliens. Perhaps Earth is a prison planet, or more likely, a planet where the aliens deposit their retarded babies to die and kill each other off.
Actually, that doesn't sound too far from the truth. I'd better shut up now.